Gokyo is primarily from a weapon (usually knife) attack. Saito shows on one of his vids that traditional ikkyo with a knife, if it gets stuck, allows them to do a nikyo on you with the blade(!).

The reason I think it 'appears' to be ura (I wouldn't like to say this is always the case) is that generally with a knife attack you just want to get out the way!

I tend not to seperate gokyo from ikkyo too much (60% of people do not realise they have been in a knife attack until afterwards). I suppose the main thing is the real entering into the elbow and off centeredness to protect yourself.